Magnetic Force on Moving Charges

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Quiz on magnetic force

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ANA JANICE ULANG

Philippines

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Froggy Jumps Magnetic Force on Moving ChargesOnline version Quiz on magnetic force by ANA JANICE ULANG 1 A positive charge moves perpendicular to a uniform magnetic field. In which direction does the force act on the charge? a Along the magnetic field lines b Along the velocity direction c Perpendicular to both velocity and field, via the right-hand rule 2 If v is parallel to B, what is the magnetic force on the moving charge? a Zero, because v × B = 0 b Maximum force c Direction opposite to velocity 3 A charge q moves with velocity v in a uniform B field. Which equation gives the magnetic force magnitude? a F = q v / B b F = q v B sinθ c F = q B / v 4 Which rule helps determine the direction of the magnetic force on a positive charge? a Left-hand rule b Right-hand rule for v × B c Fleming’s left-hand rule 5 A particle with charge q moves in a plane perpendicular to B. If v and B are perpendicular, what is the angle θ between v and B? a 0 degrees b 45 degrees c 90 degrees 6 For a negative charge, how does the direction of the magnetic force compare to that given by the right-hand rule? a Opposite to the direction predicted by the right-hand rule b Perpendicular to it c Same as the right-hand rule 7 What happens to the magnetic force if the charge’s speed doubles but B stays the same and θ remains 90°? a The force halves b The force doubles c The force stays the same 8 If a charge moves parallel to B, what is the resulting trajectory under magnetic influence alone? a Helical path b No magnetic force, straight-line motion c Circular path 9 Which quantity remains constant for a charged particle in a uniform magnetic field with no electric field? a Kinetic energy remains constant b Magnetic force magnitude is constant if v is constant and θ fixed c Charge remains constant but force changes 10 The Lorentz force on a moving charge is given by F = q(v × B). What is the direction of F if v is to the east and B is to the north? (Positive charge) a North (along B) b Upward (perpendicular to both, using right-hand rule) c East (along v)

Froggy Jumps

Magnetic Force on Moving ChargesOnline version

Quiz on magnetic force

by ANA JANICE ULANG

A positive charge moves perpendicular to a uniform magnetic field. In which direction does the force act on the charge?

Along the magnetic field lines

Along the velocity direction

Perpendicular to both velocity and field, via the right-hand rule

If v is parallel to B, what is the magnetic force on the moving charge?

Zero, because v × B = 0

Maximum force

Direction opposite to velocity

A charge q moves with velocity v in a uniform B field. Which equation gives the magnetic force magnitude?

F = q v / B

F = q v B sinθ

F = q B / v

Which rule helps determine the direction of the magnetic force on a positive charge?

Left-hand rule

Right-hand rule for v × B

Fleming’s left-hand rule

A particle with charge q moves in a plane perpendicular to B. If v and B are perpendicular, what is the angle θ between v and B?

0 degrees

45 degrees

90 degrees

For a negative charge, how does the direction of the magnetic force compare to that given by the right-hand rule?

Opposite to the direction predicted by the right-hand rule

Perpendicular to it

Same as the right-hand rule

What happens to the magnetic force if the charge’s speed doubles but B stays the same and θ remains 90°?

The force halves

The force doubles

The force stays the same

If a charge moves parallel to B, what is the resulting trajectory under magnetic influence alone?

Helical path

No magnetic force, straight-line motion

Circular path

Which quantity remains constant for a charged particle in a uniform magnetic field with no electric field?

Kinetic energy remains constant

Magnetic force magnitude is constant if v is constant and θ fixed

Charge remains constant but force changes

The Lorentz force on a moving charge is given by F = q(v × B). What is the direction of F if v is to the east and B is to the north? (Positive charge)

North (along B)

Upward (perpendicular to both, using right-hand rule)

East (along v)

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Magnetic Force on Moving Charges

Froggy Jumps

About this activity

Created by

Download the paper version to play

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Magnetic Force on Moving ChargesOnline version

by ANA JANICE ULANG

A positive charge moves perpendicular to a uniform magnetic field. In which direction does the force act on the charge?

If v is parallel to B, what is the magnetic force on the moving charge?

A charge q moves with velocity v in a uniform B field. Which equation gives the magnetic force magnitude?

Which rule helps determine the direction of the magnetic force on a positive charge?

A particle with charge q moves in a plane perpendicular to B. If v and B are perpendicular, what is the angle θ between v and B?

For a negative charge, how does the direction of the magnetic force compare to that given by the right-hand rule?

What happens to the magnetic force if the charge’s speed doubles but B stays the same and θ remains 90°?

If a charge moves parallel to B, what is the resulting trajectory under magnetic influence alone?

Which quantity remains constant for a charged particle in a uniform magnetic field with no electric field?

The Lorentz force on a moving charge is given by F = q(v × B). What is the direction of F if v is to the east and B is to the north? (Positive charge)

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